jenkins: fix syntax

Jenkinsfile

@@ -14,6 +14,7 @@ pipeline {
             }
         }
         stage('Flutter builds') {
+            steps {
                 sh 'devenv shell dart run pdfrx:remove_wasm_modules --revert' // Make sure WASM is put in output
                 sh 'devenv shell flutter build web --release'
 
@@ -22,6 +23,7 @@ pipeline {
 
                 sh 'devenv shell dart run pdfrx:remove_wasm_modules --revert' // Reset again, just to be sure
             }
+        }
         stage('Parallel Deploy') {
             parallel {
                 stage('Web') {
@@ -80,7 +82,6 @@ pipeline {
             }
         }
     }
-    }
     post {
         always {
             step([$class: 'Mailer', notifyEveryUnstableBuild: true, recipients: emailextrecipients([developers(), requestor()])])